CAJ | 학술논문

聚硅氧烷的老化过程是一个复杂的过程，对于材料的使用性能有重要的影响。采用有机硅单体水解缩合制备了乙烯基、正丙基和正辛基硅树脂，表征了其基本结构参数，并研究了在N2氛围中有机基团对于残留129烷氧基稳定性的影响。通过H-NMR和 Si-NMR分析了老化前后其结构变化；采用TGA、DSC和TG-IR联用等分析手段跟踪老化过程中质量损失、焓变和产生的挥发物的特征基团。结果表明，热老化过程中硅乙烯基之间d-pπ共轭效应促进Si—OR键的断裂，同时O原子的电子云密度提高而更易进攻另一分子上的Si原子，从而使得乙烯基硅树脂进一步缩合，并放出乙醚分子。而对于烷基硅树脂在此过程则没有观测到此类缩合。
취규양완적노화과정시일개복잡적과정，대우재료적사용성능유중요적영향。채용유궤규단체수해축합제비료을희기、정병기화정신기규수지，표정료기기본결구삼수，병연구료재N2분위중유궤기단대우잔류129완양기은정성적영향。통과H-NMR화 Si-NMR분석료노화전후기결구변화；채용TGA、DSC화TG-IR련용등분석수단근종노화과정중질량손실、함변화산생적휘발물적특정기단。결과표명，열노화과정중규을희기지간d-pπ공액효응촉진Si—OR건적단렬，동시O원자적전자운밀도제고이경역진공령일분자상적Si원자，종이사득을희기규수지진일보축합，병방출을미분자。이대우완기규수지재차과정칙몰유관측도차류축합。
The thermal aging process of polysiloxane is very complicated,which affects the use performance of material deeply. The vinyl silicone resin, n-propyl and n-octyl silicone resins were synthesized from a variety of alkoxysilanes and their basic structural parameters were characterized.Then the comparison of aging behavior of the vinyl 1 29silicone resin and other alkyl silicone resins in N2 atmosphere using H NMR, SiNMR, TG, DSC and other methods was discussed,which showed that the d-pπ conjugative effect between siliconation and vinyl group facilitated the fracture of Si-OR bond and increased the oxygen atom's electron cloud density,which make it easier to attack the Si atom of another molecule.So the thermal condensation of vinyl silicone resin was easier than alkyl silicone resin.